Abee Chm Maker is a program for making chm-files. It is free and can be downloaded from here [2]. It has a simple and comprehensible interface that allow you to make CHM-files (with contents). I tried it on a simple problem, and it worked and seemed to be easy to use.

An X-Windows viewer for .chm files can be downloaded from here [3]. lexfiend 4 Dec 2005: This and several other *nix-based CHM viewers uses the "CHM lib" library [4], not to be confused with Matt Russotto's chmlib that can be found in his "CHM tools" package [5].

PT: "Yes. MS issue a HTML compiler. You can take a web site and turn it into a chm file quite easily. You have to dig around in MSDN to find the package to download though. It used to be on the Platform SDK disk."

PT: It's called the MS HTML Help 1.4 SDK and you can download it from [6] and view the documentation there.

With NT (?) and earlier, Microsoft's help format was .hlp, rather than .chm. Here [7] are products which run under Linux (among other platforms) and understand .hlp's (never-publicly-documented?) format.